Rotary bending fatigue test is one of the important means to detect the qualification rate of aviation conduits. In the rotary bending fatigue test of the no flaring conduit, the strain gauge is usually pasted near the maximum stress that the conduit bears, but there are inevitably errors between them, which affect the test results. In order to solve this problem, based on the theoretical analysis of stress-strain, Abaqus software was used to carry out finite element simulation of 7 kinds of common specifications of TA18 no flaring conduit, and the strain value at the position of the strain gauge and the maximum strain value of the conduit were obtained, and the experiment was carried out. The results show that the relative error between the maximum strain actually generated by the conduit and the strain value measured at the position of the strain gauge is about 7%. Referring to the navigation mark, the test was carried out by the correction method that the reading of the strain gauge was lower than the theoretical strain value by 5%. It has certain guiding significance to ensure the accuracy of the test results.